$ git clone -n https://src.fedoraproject.org/rpms/bootc.git /var/lib/mock/f40-build-2124661-50776/root/chroot_tmpdir/scmroot/bootc
Cloning into '/var/lib/mock/f40-build-2124661-50776/root/chroot_tmpdir/scmroot/bootc'...
$ git fetch origin 009ff3422d6ce7d86b7490ffb18f9bc61386af5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bootc
 * [new ref]         009ff3422d6ce7d86b7490ffb18f9bc61386af5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 009ff34 https://github.com/containers/bootc/releases/tag/v0.1.5